A study conducted at Manatee community collage revealed that students who attended class 95 to 100% of the time usually received an A in the class. Students who attended class 80 to 90% of the time usually received a B or C in the class. Students who attended class less then 80% of the time usually received a D or an F or eventually withdraw from the class. based on this information, attendance and grade are related. the more you attend class, the more likely you will receive a high grade. if you improve your attendance , your grade will probably improve.

what is the variable under study

what is the date in the study